The 'Quickest' A-Body Small Blocks

1968 '340' Camshafts

Factory Advertised Specifications

4-Speed
* Lift ............ .445"/.456"
* Duration ..... 284*/292* Duration
* Overlap ...... 60* Overlap
* Centerline .. 114*

Automatic
* Lift ........... .430"/.445"
* Duration .... 276*/284*
* Overlap ...... 52*
* Centerline .. 114*

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1969 and later '340' Camshafts

* Lift ........... .429"/.444"
* Duration .... 268*/276*
* Overlap ...... 44*
* Centerline .. 114*